Vertically operable restraint for a loading dock having an operable secondary restraint

ABSTRACT

A vehicle restraint for a loading dock includes a barricade member that is rotationally operable between a stored position, a blocking position and a verification position. The barricade member in the blocking position is adapted to laterally secure a vehicle relative to the loading dock. An operable latch is coupled proximate an outer end in the barricade member. The operable latch is selectively operable between retracted and extended positions. When the barricade member is in the blocking position and the operable latch is in the extended position, the operable latch vertically secures the vehicle relative to the barricade member.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 15/875,371 filed Jan. 19, 2018, entitled VERTICALLY OPERABLERESTRAINT FOR A LOADING DOCK HAVING AN OPERABLE SECONDARY RESTRAINT,which claims priority to and the benefit under 35 U.S.C. § 119(e) ofU.S. Provisional Patent Application No. 62/450,712, filed on Jan. 26,2017, entitled BARRICADE-TYPE RESTRAINT FOR A LOADING DOCK HAVING ANOPERABLE SECONDARY RESTRAINT, and U.S. Provisional Patent ApplicationNo. 62/508,590, filed on May 19, 2017, entitled VERTICALLY OPERABLERESTRAINT FOR A LOADING DOCK HAVING AN OPERABLE SECONDARY RESTRAINT, theentire disclosures of which are hereby incorporated herein by reference.

FIELD OF THE INVENTION

The present invention generally relates to barricade restraints forloading docks, and more specifically, a barricade restraint for aloading dock having a secondary restraint for vertically securing atleast a portion of a vehicle parked at a loading dock.

BACKGROUND OF THE INVENTION

Various loading docks can include barricade restraints that arerotationally operable to a vertical position when a trailer or othervehicle is parked at a loading dock. The vertical position of thebarricade restraint maintains the position of the rear impact guardbetween the barricade restraint and a wall of the loading dock. Thebarricade restraint includes a locking mechanism that secures thebarricade restraint in the vertical position until the locking mechanismis removed.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, a vehicle restraintfor a loading dock includes a barricade member that is rotationallyoperable between at least a stored position and a blocking position. Thebarricade member in the blocking position is adapted to laterally securea vehicle relative to the loading dock. An operable latch is coupledproximate an outer end in the barricade member. The operable latch isselectively operable between retracted and extended positions. When thebarricade member is in the blocking position and the operable latch isin the extended position, the operable latch vertically secures thevehicle relative to the barricade member.

According to another aspect of the present invention, a vehiclerestraint for a loading dock includes a barricade member that isrotationally attached to a base. The barricade member is rotationallyoperable between stored, blocking and verification positions, whereinthe base and the barricade member are vertically operable relative tothe loading dock. An operable latch is coupled proximate an outer end ofthe barricade member. The operable latch is selectively operable betweenretracted and extended positions. The barricade member in the blockingposition selectively and laterally secures a vehicle relative to theloading dock. When the barricade member is in the blocking position andthe operable latch is in the extended position, the operable latchvertically secures the vehicle relative to the barricade member.

According to another aspect of the present invention, a method foroperating a vehicle barricade restraint includes rotating a barricademember from a stored position toward a blocking position. The methodalso includes rotating the barricade member past the blocking positionto verify a location of a portion of a vehicle within a restraining areabetween the barricade member and a wall of a loading dock. The methodalso includes returning the barricade member to the blocking positionafter the location of the portion of the vehicle has been verified. Themethod also includes positioning an operable latch of the barricademember within the restraining area between the barricade member and thewall of the loading dock.

These and other aspects, objects, and features of the present inventionwill be understood and appreciated by those skilled in the art uponstudying the following specification, claims, and appended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a perspective view of a loading dock incorporating an aspectof a barricade restraint including an operable latch;

FIG. 2 is a side perspective view of a barricade restraint set in ablocking position and showing the operable latch in a retractedposition;

FIG. 3 is a side perspective view of a trailer parked at a loading dockhaving a barricade restraint;

FIG. 4 is a front elevational view of an aspect of a barricade restraintincorporating the operable latch;

FIG. 5 is a cross-sectional view of the barricade restraint of FIG. 4taken along line V-V and showing the operable latch in the extendedposition;

FIG. 6 is a side elevational view of an aspect of the operable latchrotationally coupled to the outer end of the barricade member and shownin the retracted position;

FIG. 7 is a front elevational view of the operable latch of FIG. 6;

FIG. 8 is a side elevational view of a barricade restraint engaging arear impact guard of the vehicle and showing the operable latch in aretracted position;

FIG. 9 is an elevational view of the barricade restraint of FIG. 8showing the operable latch in the extended position;

FIG. 10 is a schematic flow diagram illustrating a method for operatinga barricade restraint having an operable latch; and

FIG. 11 is a side perspective view of an aspect of a barricade restraintset in a stored position and showing the operable latch in a retractedposition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

For purposes of description herein, the terms “upper,” “lower,” “right,”“left,” “rear,” “front,” “vertical,” “horizontal,” and derivativesthereof shall relate to the invention as oriented in FIG. 1. However, itis to be understood that the invention may assume various alternativeorientations, except where expressly specified to the contrary. It isalso to be understood that the specific devices and processesillustrated in the attached drawings, and described in the followingspecification are simply exemplary embodiments of the inventive conceptsdefined in the appended claims. Hence, specific dimensions and otherphysical characteristics relating to the embodiments disclosed hereinare not to be considered as limiting, unless the claims expressly stateotherwise.

As shown in FIGS. 1-5 and 11, reference numeral 10 generally refers to abarricade restraint installed proximate a loading dock 12. Typically,the loading dock 12 can include a dock leveler 14 and a dock shelter 16surrounding a loading dock door 18. The barricade restraint 10 caninclude a barricade member 20 that is rotationally operable at leastbetween a stored position 22 and a blocking position 24. The barricademember 20 in the blocking position 24 is adapted to laterally secure atrailer 26 and/or vehicle relative to the loading dock 12 and typicallybetween the barricade member 20 and the wall 28 of the loading dock 12.An operable latch 30 is coupled proximate the outer end 32 of thebarricade member 20. The operable latch 30 is selectively operablebetween a retracted position 34 and an extended position 36. When thebarricade member 20 is in the blocking position 24 and the operablelatch 30 is in the extended position 36, the operable latch 30vertically secures the vehicle relative to the barricade member 20.Accordingly, the extended position 36 of the operable latch 30 extendstoward the wall 28 of the loading dock 12 from the barricade member 20in the blocking position 24.

Referring again to FIGS. 1-5 and 11, the barricade restraint 10 includesopposing structural plates 40 that extend upward from a base member 42.The base member 42 can be set upon or attached to a ground surface 44 infront 92 of the loading dock 12. The barricade restraint 10 can alsoinclude a back plate 46 that is anchored to the wall 28 of the loadingdock 12. In various embodiments, the barricade restraint 10 can bevertically operable relative to the ground surface 44. In such anembodiment, the barricade restraint 10 can include a vertical tracksystem 50 along which the back plate 46 and/or the base member 42 canperform a vertical translation 52. The use of the track system 50 isadapted to vertically align the barricade member 20 and the operablelatch 30 with the rear impact guard 82 of the trailer 26.

Referring again to FIGS. 1-5, the barricade member 20 of the barricaderestraint 10 can be rotated between the structural plates 40 throughoperation of a barricade motor 48 or other similar actuating mechanism.Such actuating mechanisms can include, but are not limited to, hydrauliccylinders, pneumatic members, combinations thereof, and other similaroperating mechanisms adapted to rotate the barricade member 20 at leastbetween the stored position 22 and the blocking position 24.

Referring again to FIGS. 1-5, a locking member 60 is disposed betweenthe structural plates 40 and is rotated through operation of a lockingmotor 62. The locking member 60 is rotationally operable between alocking position 64 and a release position 66. Typically, the lockingmember 60 will remain in the release position 66 when the barricademember 20 is away from or distal from the blocking position 24. When thebarricade member 20 is moved to the blocking position 24, the lockingmember 60 can be rotated to the locking position 64. In thisconfiguration, the barricade member 20 is not operable out of theblocking position 24 until such time as the locking member 60 is movedfrom the locking position 64 to the release position 66. In this manner,the operating mechanism for the barricade member 20 serves to generallymove the barricade member 20 between the various positions. Typically,the operating mechanism does not serve to secure the barricade member 20in the blocking position 24. Rather, the locking member 60 in thelocking position 64 secures the barricade member 20 in the blockingposition 24 and prevents rotation of the barricade member 20 out of theblocking position 24. Accordingly, the barricade member 20 is able tosecure very large loads and prevent forward movement of the vehicle whensecured between the barricade member 20 within a restraining area 68defined in the blocking position 24 and the wall 28 of the loading dock12.

Referring again to FIGS. 1-5, the barricade restraint 10 can include thebarricade motor 48 that selectively activates to rotate the barricademember 20 between the plurality of positions. The locking motor 62 is aseparate motor that is adapted to selectively activate for operating thelocking member 60 between the locking and release positions 64, 66. Asdiscussed above, when the barricade member 20 is in the blockingposition 24 and the locking member 60 is in the locking position 64, itis typical that the barricade motor 48 and locking motor 62 aresubstantially idle or only minimally operable such that the positioningof the barricade member 20 and locking member 60 in these positionsholds the barricade member 20 in the blocking position 24.

Referring again to FIGS. 4 and 5, the operable latch 30 is adapted tosupplement the lateral securing features of the barricade member 20 inthe blocking position 24. In this manner, the operable latch 30 in theextended position 36 extends into the restraining area 68 and toward thewall 28 of the loading dock 12 from the retaining surface 80 of thebarricade member 20. Accordingly, at least a portion of the operablelatch 30 in the extended position 36 is adapted to extend over a portionof the rear impact guard 82 of the vehicle. Through this positioning,the rear impact guard 82 is laterally secured by the barricade member 20and also vertically secured by the operable latch 30 in the extendedposition 36.

As exemplified in FIG. 3, in certain situations, the landing gear 90 ofa trailer 26 located near the front 92 of the trailer 26 may fail andcause the front 92 of the trailer 26 to dip downward. This downward dipat the front 92 of the trailer 26 can cause an upward lift 94 at therear 96 of the trailer 26 in the area of the rear impact guard 82. Ifthis lift 94 at the rear 96 of the trailer 26 is significant enough, therear impact guard 82 may extend over the outer end 32 of the barricademember 20, such that the vehicle may become unsecured from between thebarricade member 20 and the wall 28 of the loading dock 12. Theinclusion of the operable latch 30, as exemplified in FIGS. 4-9, canserve to provide vertical support to the rear impact guard 82 ininstances where the landing gear 90 of the trailer 26, or other portionof the trailer 26, may fail. The operable latch 30 provides somevertical reinforcement to maintain the rear impact guard 82 within therestraining area 68 between the barricade member 20 and the wall 28 ofthe loading dock 12.

As exemplified in FIGS. 4 and 5, the operable latch 30 can be linearlyoperable between the retracted and extended positions 34, 36. It iscontemplated that the linear operation between the retracted andextended positions 34, 36 of the operable latch 30 can be through abiasing mechanism 100. This biasing mechanism 100, which is typicallyoperated by a spring, can retract when the barricade member 20 is movedout of the blocking position 24. When the barricade member 20 is movedinto the blocking position 24, the internal spring 102 of the biasingmechanism 100 can bias the operable latch 30 to the extended position 36and over at least a portion of the rear impact guard 82. In this manner,it is contemplated that the operable latch 30 can be biased toward theextended position 36.

Referring now to FIGS. 6-9, it is contemplated that the operable latch30 can be a rotationally operable member that is operable between theretracted and extended positions 34, 36 about a latch pivot 110 thatextends through a portion of the barricade member 20. This latch pivot110 can include a biasing mechanism 100 that biases the operable latch30 toward the extended position 36. It is also contemplated that theoperable latch 30 can be rotationally operable from the extendedposition 36 to the retracted position 34 when the barricade member 20 ismoved from the blocking position 24, and vice versa when the barricademember 20 moves into the blocking position 24.

According to the various embodiments, as exemplified in FIGS. 1-9 and11, the barricade restraint 10 can also include a verification position120. In the verification position 120, the barricade member 20 rotatesforward past the blocking position 24 and toward the wall 28 of theloading dock 12. This verification position 120 serves to ensure thatthe rear impact guard 82 is located in the restraining area 68 betweenthe barricade member 20 and the wall 28 of the loading dock 12. Toassist in the movement of the barricade member 20 to the verificationposition 120, the barricade restraint 10 can include a tilt sensor 122that monitors the rotational position of the barricade member 20. Whenthe barricade member 20 passes the blocking position 24 and moves towardthe wall 28 of the loading dock 12, the tilt sensor 122 monitors theposition of the barricade member 20 when it engages an obstruction. Ifthis obstruction is the wall 28 of the loading dock 12, the tilt sensor122 measures this rotational movement and verifies that the rear impactguard 82 is not located between the barricade member 20 and the wall 28of the loading dock 12. Conversely, where the barricade member 20 doesengage the rear impact guard 82 and stops short of the wall 28 of theloading dock 12, the tilt sensor 122 monitors the rotational position ofthe barricade member 20 and verifies that the rear impact guard 82 islocated in the restraining area 68. It is contemplated that the operablelatch 30 can be used to assist the tilt sensor 122 in this verificationphase. When the barricade member 20 engages either the wall 28 of theloading dock 12 or the rear impact guard 82, the operable latch 30 maybe biased away from the extended position 36. This movement of theoperable latch 30 may serve as an additional indicia or signal as towhether the rear impact guard 82 is located between the barricade member20 and the wall 28 of the loading dock 12.

Referring again to FIGS. 2-9 and 11, the operable latch 30 can beoperated solely by the biasing mechanism 100 contained within theoperable latch 30. In such an embodiment, the biasing mechanism 100maintains the operable latch 30 in the extended position 36. Where anobstruction engages latching end 130 of the operable latch 30, suchengagement may bias the operable latch 30 back toward the retractedposition 34.

Referring again to FIGS. 2-9 and 11, it is also contemplated that theoperable latch 30 can be moved between the extended and retractedpositions 36, 34 through the operation of an actuator 132. This actuator132 can be a two-way actuator that manipulates the operable latch 30between the extended and retracted positions 36, 34. The actuator 132can also be a one-way actuator that serves to overcome the biasing force134 of the biasing mechanism 100 to manipulate the operable latch 30from the extended position 36 to the retracted position 34. When it isnecessary for the operable latch 30 to move back to the extendedposition 36, the actuator 132 can disengage and allow the biasingmechanism 100 to apply the biasing force 134 that extends, or rotates,the operable latch 30 to the extended position 36. It is alsocontemplated that the operable latch 30 can include an internal lockingmechanism 136 that secures the operable latch 30 in the extendedposition 36. Such an internal locking mechanism 136 may assist inpreventing an upward force 138 from the rear impact guard 82 from movingthe operable latch 30 back to the retracted position 34 and allowing therear impact guard 82 to extend over the barricade member 20. Theinternal locking mechanism 136 serves to maintain the operable latch 30in the extended position 36 to further maintain the positioning of therear impact guard 82 between the barricade member 20 and the wall 28 ofthe loading dock 12. The extended and retracted positions 36, 34 of theoperable latch 30 can be defined by portions of the operable latch 30engaging a surface of the barricade member 20. In this manner, overrotation of the operable latch 30 can be prevented. By way of example,when the operable latch 30 reaches the extended position 36, the biasingmechanism 100 urges a portion of the operable latch 30 against thebarricade member 20. This surface may be an outer surface 150 or aninternal stopping surface 152 that engages the operable latch 30.Similarly, the outer surface 150 of the barricade member 20 and/or theinternal stopping surface 152 may also prevent rotation of the operablelatch 30 beyond the retracted position 34.

When the barricade member 20 is in the blocking position 24 and theoperable latch 30 is in the extended position 36, the barricade member20 is adapted to engage a back surface 160 of the rear impact guard 82.Additionally, the operable latch 30 is adapted to engage a top surface162 of the rear impact guard 82. Accordingly, the barricade member 20and the operable latch 30 are adapted to at least partially surround therear impact guard 82 to provide at least two directions of securingforce to maintain the position of the rear impact guard 82 in therestraining area 68 relative to the wall 28 of the loading dock 12.

As discussed above, the vertical support provided by the operable latch30 may be useful as the design of the barricade restraint 10 typicallycalls for the blocking position 24 to be defined by a single rotationalposition. In this manner, the rear impact guard 82 can be located in aseries of lateral positions within the restraining area 68 between thebarricade member 20 and the blocking position 24 and the wall 28 of theloading dock 12. Accordingly, the rear impact guard 82 may or may not bein contact with the barricade member 20 and the operable latch 30 whilein the restraining area 68. Regardless of the position of the rearimpact guard 82 within this restraining area 68, the blocking position24 of the barricade member 20 is limited to this vertically orientedposition substantially parallel with the wall 28 of the loading dock 12.The addition of the operable latch 30 serves to provide some verticalsecuring force to prevent the rear impact guard 82 from escaping thisrestraining area 68 between the barricade member 20 and the wall 28 ofthe loading dock 12.

Referring now to FIGS. 1-11, having described various aspects of theoperable latch 30 incorporated within the barricade restraint 10, amethod 400 is disclosed for operating a barricade restraint 10 thatincludes the operable latch 30. According to the method 400, thebarricade member 20 is rotated from the stored position 22 and towardthe blocking position 24 (step 402). Typically, the stored position 22will be a generally horizontal orientation of the barricade member 20.Additionally, the stored position 22 of the barricade member 20 may alsobe defined by a lowered position 180 of the barricade restraint 10 alongthe track system 50. Alternatively, the stored position 22 of thebarricade member 20 can be defined by the barricade member 20 beingpositioned below the top edge 170 of the structural plates 40 for thebarricade restraint 10. As the barricade member 20 is moved toward theblocking position 24, the barricade member 20 may continue rotation pastthe blocking position 24 to conduct a verification step (step 404). Thisverification step 404 is defined by the barricade member 20 beingrotated past the blocking position 24 and toward the verificationposition 120. This movement of the barricade member 20 toward theblocking position 24 as well as to the verification position 120 duringthe verification step 404 may also be in conjunction with a selectiveand vertical translation 52 of the barricade restraint 10 along thetrack system 50 and into a raised position 182 above the ground surface44. The selective vertical translation 52 can be utilized to accommodatea wide variety of rear impact guards 82 as well as rear impact guards 82that may be bent or damaged. When the barricade member 20 is stopped byan obstruction, the tilt sensor 122 of the vehicle restraint measuresthe rotational position of the barricade member 20 when it encountersthe obstruction. According to step 406, the barricade member 20 isreturned to the blocking position 24 when the verification step 404determines that a rear impact guard 82 of a trailer 26 is positionedbetween the barricade member 20 and the wall 28 of the loading dock 12.Alternatively, where the barricade member 20 engages the wall 28 of theloading dock 12, the barricade member 20 can be returned to the storedposition 22 after the verification step 404 determines that the rearimpact guard 82 was not properly positioned in the restraining area 68.According to step 408 of the method 400, when the barricade member 20 isreturned to the blocking position 24 with the rear impact guard 82positioned between the barricade member 20 and the wall 28 of theloading dock 12, the operable latch 30 is positioned in the extendedposition 36. This extended position 36 is defined by a portion of theoperable latch 30 extending into and over the restraining area 68.

This positioning of the operable latch 30 serves to provide at leastsome vertical support for preventing the rear impact guard 82 frommoving in an upward direction and over the barricade member 20 of thebarricade restraint 10.

According to the various embodiments, the barricade restraint 10 havingthe operable latch 30 that is linearly or rotationally operable withrespect to the barricade member 20 can be adapted to secure a rearimpact guard 82 of a trailer 26, transport truck, or other similarvehicle that is compatible with loading and unloading via a loading dock12.

It is further contemplated that the operating mechanism for removing theoperable latch 30 between the extended and retracted positions 36, 34can be incorporated within the barricade motor 48. In such anembodiment, it is contemplated that when the barricade member 20 issecured by the locking member 60, further operation of the barricademotor 48 can manipulate the position of the operable latch 30 betweenthe extended and retracted positions 36, 34. It is also contemplatedthat the operable latch 30 can be activated through a separatelydedicated actuator 132.

It is to be understood that variations and modifications can be made onthe aforementioned structure without departing from the concepts of thepresent invention, and further it is to be understood that such conceptsare intended to be covered by the following claims unless these claimsby their language expressly state otherwise.

What is claimed is:
 1. A vehicle restraint for a loading dock, the vehicle restraint comprising: a barricade member that is rotationally operable between a stored position, a blocking position and a verification position, wherein the barricade member in the blocking position selectively secures the a vehicle relative to the loading dock; and a locking member that is rotationally operable between a locking position and a release position, wherein the locking member is selectively operable to the locking position when the barricade member is in the blocking position; and a barricade motor that selectively activates to rotationally operate the barricade member between the stored, blocking and verification positions, wherein the barricade motor is selectively idle when the locking member is in the locking position and the barricade member is in the blocking position, and wherein the locking member selectively maintains the barricade member in the blocking position.
 2. The vehicle restraint of claim 1, further comprising: a locking motor that is selectively activated to operate the locking member between the locking and release positions.
 3. The vehicle restraint of claim 1, wherein the barricade member is attached to a back plate that is vertically operable relative to the loading dock, wherein vertical translation of the back plate selectively defines lowered and raised positions of the barricade member.
 4. The vehicle restraint of claim 3, wherein the back plate is operably attached to a track system that is coupled to the loading dock, and wherein the back plate and the barricade member are vertically operable relative to the track system.
 5. The vehicle restraint of claim 1, wherein the blocking position of the barricade member is defined by the barricade member being oriented in a generally vertical position with respect to the loading dock.
 6. The vehicle restraint of claim 1, wherein the barricade member includes an operable latch that is linearly operable between retracted and extended positions.
 7. The vehicle restraint of claim 6, wherein the operable latch is laterally operable with respect to the barricade member.
 8. The vehicle restraint of claim 1, wherein the locking member remains in the release position when the barricade member is distal from the blocking position.
 9. The vehicle restraint of claim 1, further comprising: a tilt sensor that monitors a rotational position of the barricade member.
 10. The vehicle restraint of claim 9, wherein the tilt sensor is in communication with the barricade motor.
 11. The vehicle restraint of claim 1, wherein the blocking position is defined by a single rotational position of the barricade member.
 12. A vehicle restraint for a loading dock, the vehicle restraint comprising: a barricade member that is rotationally attached to a base, and wherein the barricade member is rotationally operable between stored, blocking and verification positions, wherein the base and the barricade member are vertically operable relative to the loading dock; a barricade motor that selectively activates to rotationally operate the barricade member between the stored, blocking and verification positions; and a locking member that is operable between a locking position and a release position, wherein the locking member is selectively operable to the locking position when the barricade member is in the blocking position, wherein the barricade motor is selectively idle when the locking member is in the locking position and the barricade member is in the blocking position, and wherein the locking member selectively maintains the barricade member in the blocking position.
 13. The vehicle restraint of claim 12, wherein the barricade member is attached to a back plate that is vertically operable relative to the loading dock, wherein vertical translation of the back plate selectively defines lowered and raised positions of the barricade member.
 14. The vehicle restraint of claim 13, wherein the back plate is operably attached to a track system that is coupled to the loading dock, and wherein the back plate and the barricade member are vertically operable relative to the track system.
 15. The vehicle restraint of claim 12, wherein the blocking position of the barricade member is defined by the barricade member being oriented in a generally vertical position with respect to the loading dock.
 16. The vehicle restraint of claim 12, wherein the locking member remains in the release position when the barricade member is distal from the blocking position.
 17. The vehicle restraint of claim 15, wherein the blocking position is defined by a single rotational position.
 18. The vehicle restraint of claim 12, further comprising: a tilt sensor that monitors a rotational position of the barricade member.
 19. A vehicle restraint comprising: a barricade member that is rotationally operable relative to a base between stored, blocking and verification positions, wherein the barricade member is coupled with a back plate that is configured to be vertically operable relative to a loading dock, wherein vertical translation of the back plate selectively defines lowered and raised positions of the barricade member; a barricade motor that selectively activates to rotationally operate the barricade member between the stored, blocking and verification positions; and a locking member that is operable between a locking position and a release position, wherein, the locking member is selectively operable to the locking position when the barricade member is in the blocking position; the barricade motor is selectively idle when the locking member is in the locking position and the barricade member is in the blocking position; and the locking member selectively maintains the barricade member in the blocking position.
 20. The vehicle restraint of claim 19, further comprising: a tilt sensor that monitors a rotational position of the barricade member. 